package com.itheima.stock.aspect;


import com.google.common.util.concurrent.RateLimiter;
import com.itheima.stock.enums.CodeEnum;
import com.itheima.stock.response.ResponseResult;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

/**
 * 流量控制切面类
 */
@Aspect
@Component
public class LimiterAspect {

    private final RateLimiter rateLimiter;

    public LimiterAspect(RateLimiter rateLimiter) {
        this.rateLimiter = rateLimiter;
    }

    @Pointcut(value = "@annotation(com.itheima.stock.annotation.Limiter)")
    public void pt(){}

    @Around(value = "pt()")
    public Object limiter(ProceedingJoinPoint pjp) throws Throwable {
        //流量控制
        boolean flag = rateLimiter.tryAcquire();
        if(flag) {
            return pjp.proceed();
        } else {
            return ResponseResult.error(CodeEnum.OVER_CONCURRENT_NUM);
        }
    }

}
